Collaborative Research: Dating Sedimentary Sequences: In Situ U/Th-Pb Microprobe Dating of Early Diagenetic Monazite in Neoproterozoic Black Shales

合作研究：沉积层序测年：新元古代黑色页岩中早成岩独居石原位 U/Th-Pb 微探针测年

• 批准号: 0643364
• 负责人: Laura Crossey
• 金额: $ 2.92万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0643364&HistoricalAwards=false
• 关键词: Collaborative; Research; Dating; Sedimentary; Sequences

This study will provide new technologies to directly date sedimentary sequences. Proof of the concept will come from dating Neoproterozoic black shales in Grand Canyon via in situ U/Th-Pb microprobe dating of authigenic grains that were precipitated by microbial processes near the time of lithification. New technologies will minimize electron beam diameter, count rate, background regression, conductive coating, interference correction, and error estimation. Geologic applications include precise dating of Neoproterozoic C-isotope excursions.

这项研究将提供直接测定沉积序列年代的新技术。这一概念的证明将来自于对大峡谷新元古代黑色页岩进行定年，通过原位 U/Th-Pb 微探针对岩化时期微生物过程沉淀的自生颗粒进行测年。新技术将最大限度地减少电子束直径、计数率、背景回归、导电涂层、干扰校正和误差估计。地质应用包括新元古代 C-同位素偏移的精确测年。